Howard, Needles, Tammen & Bergendoff Corporation

of Kansas City, Kansas
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Formerly named Howard, Needles, Tammen & Bergendoff, this company began under the name Harrington, Howard & Ash in 1914 specializing in the design of moveable bridges as well as railroad bridges. In 1941 it changed its name bacl to Howard, Needles, Tammen & Bergendoff. Another associated name was Ash, Howard, Needles, and Tammen. Many historic bridges were designed by this firm under any of these former names. However the HNTB name of today is associated with demolition and replacement of historic bridges, with the company being one of the leading designers of large modern bridges, particularly cable-stayed bridges.

6th Street North Viaduct (Milwaukee County, Wisconsin)
Built 2002
Cable-stayed bridge over St Paul Avenue and Canadian Pacific RR on N 6th Street in Milwaukee
Open to traffic

6th Street South Viaduct (Milwaukee County, Wisconsin)
Built 2002
Cable-stayed bridge over Canadian Pacific RR on S 6th Street in Milwaukee
Open to traffic

Absecon Boulevard Bridge (Atlantic County, New Jersey)
Built 1946
Deck plate girder bridge over Intracoastal Waterway on New Jersey Route 30
Open to traffic

Blennerhassett Island Bridge (Washington County, Ohio)
Design, 2008
Network arch bridge over Ohio River at Blennerhassett Island on US 50
Open to traffic

BNSF - Quincy Railroad Bridge (Adams County, Illinois)
Built 1960
Through truss bridge over the Mississippi River on BNSF Railway at Quincy
Open to railroad traffic

BNSF - Sioux City Bridge (Woodbury County, Iowa)
Design, 1982
Through truss bridge over Missouri River on BNSF Railway in Sioux City
Open to traffic

Bob Kerrey Pedestrian Bridge (Douglas County, Nebraska)
Desginer, 2008
Cable-stayed bridge over Missouri River on bike trail (next to a national park service building) in Omaha
Open to pedestrians and bicyclists

Broadway Bridge (Jackson County, Missouri)
Design, 1955
Steel tied through arch bridge over Missouri River on Broadway Blvd (US 169) in Kansas City
Open to traffic

Broadway-Woodswether Viaduct (Jackson County, Missouri)
Built 1951
Beam bridge over Kansas City Southern Railway and other RRs on Woodswether Road
Open to traffic

Champ Clark Bridge (Pike County, Illinois)
Built 2017
Concrete deck girder bridge over Mississippi River on US 54
Open to traffic

Chelsea Street Bridge (New) (Suffolk County, Massachusetts)
Built 2014
Modern Warren through truss bridge over Chelsea Creek on Chelsea Street
Open to traffic

CP - Mississippi River Bridge (Dakota County, Minnesota)
Designer, 1981
Vertical Lift Bridge with a Warren through truss bridge span over Mississippi River/1st Street on Railroad
Open to rail traffic

Dames Point Bridge (Duval County, Florida)
Built 1989
Cable-stayed bridge over St. Johns River on FL 9A in Jacksonville
Open to traffic

Delaware Memorial Bridge (1951 Eastbound) (New Castle County, Delaware)
Consulting engineers, 1951
Suspension bridge over Delaware River on Eastbound I-295/US 40
Open to traffic

Delaware Memorial Bridge (1968 Westbound) (New Castle County, Delaware)
Built 1968
Suspension bridge over Delaware River on Westbound I-295/US 40
Open to traffic

DM&IR Ore Dock #5 Viaduct (St. Louis County, Minnesota)
Designer of 1966 Reconfiguration for Interstate 35, 1913
Abandoned girder bridge over Grand Avenue, Carlton Street, South Michigan Street, & Interstate 35 on Duluth, Missabe, & Iron Range Railroad Ore Dock #5

FIR - Industrial Flats Lift Bridge (Cuyahoga County, Ohio)
Built 1953
Through truss bridge over Cuyahoga River on Flats Industrial Railroad
Open to traffic but seldom used

General W.K. Wilson, Jr. Bridge (Mobile County, Alabama)
Design, 1980
Through arch bridge over Mobile River on I-65
Open to traffic

Greenville Bridge (Chicot County, Arkansas)
Designer, 2010
Cable-stayed bridge over Mississippi River on US 82
Opened August 4, 2010

I-90 - Westfield River Bridge (Hampden County, Massachusetts)
Built 1957
Deck truss bridge over Westfield River & US 20 on I-90 in Montgomery
Open to traffic

Jesse Jones Bridge (Harris County, Texas)
Consulting Engineer, 1980
Haunched concrete deck girder bridge over Houston Ship Channel on Beltway 8
Open to traffic

Julien Dubuque Bridge (Dubuque County, Iowa)
Designer, 1943
Steel through arch bridge over the Mississippi River on US 20 at Dubuque
Open to traffic

Lake Champlain Bridge (Essex County, New York)
Design, 2011
Network arch bridge over Lake Champlain on NY 185/VT 17
Open to traffic

Leonard P. Zakim Bunker Hill Memorial Bridge (Suffolk County, Massachusetts)
Built 2003
Cable-stayed bridge over Charles River on I-93/US-1 in Boston
Open to traffic

MoPac - Algiers Canal Bridge (Plaquemines Parish, Louisiana)
Built 1957
Through truss bridge over Algiers Canal (Gulf Intracoastal Waterway) on former Union Pacific RR
Closed to traffic

Stan Musial Veterans Memorial Bridge (St. Louis, Missouri)
Designer, 2010
Cable-stayed bridge over Mississippi River on Interstate 70
Open to traffic

Tilikum Crossing (Multnomah County, Oregon)
Consulting Engineering Firm, 2015
Cable-stayed bridge over Willamette River on MAX Light Rail Orange Line, Portland Streetcar, Pedestrian Path & Bus Lanes
Open to traffic

US20 Iowa River Bridge (Hardin County, Iowa)
Built 2003
Girder bridge over Iowa River on US 20
Open to traffic